src/joystick/hidapi/SDL_hidapi_stadia.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"

#ifdef SDL_JOYSTICK_HIDAPI

#include "SDL_hints.h"
#include "SDL_events.h"
#include "SDL_joystick.h"
#include "SDL_gamecontroller.h"
#include "../SDL_sysjoystick.h"
#include "SDL_hidapijoystick_c.h"
#include "SDL_hidapi_rumble.h"


#ifdef SDL_JOYSTICK_HIDAPI_STADIA

/* Define this if you want to log all packets from the controller */
/*#define DEBUG_STADIA_PROTOCOL*/

enum
{
    SDL_CONTROLLER_BUTTON_STADIA_SHARE = 15,
    SDL_CONTROLLER_BUTTON_STADIA_GOOGLE_ASSISTANT,
    SDL_CONTROLLER_NUM_STADIA_BUTTONS,
};

typedef struct {
    Uint8 last_state[USB_PACKET_LENGTH];
} SDL_DriverStadia_Context;


static SDL_bool
HIDAPI_DriverStadia_IsSupportedDevice(const char *name, SDL_GameControllerType type, Uint16 vendor_id, Uint16 product_id, Uint16 version, int interface_number, int interface_class, int interface_subclass, int interface_protocol)
{
    if (vendor_id == USB_VENDOR_GOOGLE && product_id == USB_PRODUCT_GOOGLE_STADIA_CONTROLLER) {
        return SDL_TRUE;
    }
    return SDL_FALSE;
}

static const char *
HIDAPI_DriverStadia_GetDeviceName(Uint16 vendor_id, Uint16 product_id)
{
    return "Google Stadia Controller";
}

static SDL_bool
HIDAPI_DriverStadia_InitDevice(SDL_HIDAPI_Device *device)
{
    return HIDAPI_JoystickConnected(device, NULL);
}

static int
HIDAPI_DriverStadia_GetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id)
{
    return -1;
}

static void
HIDAPI_DriverStadia_SetDevicePlayerIndex(SDL_HIDAPI_Device *device, SDL_JoystickID instance_id, int player_index)
{
}

static SDL_bool
HIDAPI_DriverStadia_OpenJoystick(SDL_HIDAPI_Device *device, SDL_Joystick *joystick)
{
    SDL_DriverStadia_Context *ctx;

    ctx = (SDL_DriverStadia_Context *)SDL_calloc(1, sizeof(*ctx));
    if (!ctx) {
        SDL_OutOfMemory();
        return SDL_FALSE;
    }

    device->dev = hid_open_path(device->path, 0);
    if (!device->dev) {
        SDL_SetError("Couldn't open %s", device->path);
        SDL_free(ctx);
        return SDL_FALSE;
    }
    device->context = ctx;

    /* Initialize the joystick capabilities */
    joystick->nbuttons = SDL_CONTROLLER_NUM_STADIA_BUTTONS;
    joystick->naxes = SDL_CONTROLLER_AXIS_MAX;
    joystick->epowerlevel = SDL_JOYSTICK_POWER_WIRED;

    return SDL_TRUE;
}

static int
HIDAPI_DriverStadia_RumbleJoystick(SDL_HIDAPI_Device *device, SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble)
{
    Uint8 rumble_packet[] = { 0x05, 0x00, 0x00, 0x00, 0x00 };

    rumble_packet[1] = (low_frequency_rumble & 0xFF);
    rumble_packet[2] = (low_frequency_rumble >> 8);
    rumble_packet[3] = (high_frequency_rumble & 0xFF);
    rumble_packet[4] = (high_frequency_rumble >> 8);

    if (SDL_HIDAPI_SendRumble(device, rumble_packet, sizeof(rumble_packet)) != sizeof(rumble_packet)) {
        return SDL_SetError("Couldn't send rumble packet");
    }
    return 0;
}

static int
HIDAPI_DriverStadia_RumbleJoystickTriggers(SDL_HIDAPI_Device *device, SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble)
{
    return SDL_Unsupported();
}

static SDL_bool
HIDAPI_DriverStadia_HasJoystickLED(SDL_HIDAPI_Device *device, SDL_Joystick *joystick)
{
    return SDL_FALSE;
}

static int
HIDAPI_DriverStadia_SetJoystickLED(SDL_HIDAPI_Device *device, SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue)
{
    return SDL_Unsupported();
}

static int
HIDAPI_DriverStadia_SetJoystickSensorsEnabled(SDL_HIDAPI_Device *device, SDL_Joystick *joystick, SDL_bool enabled)
{
    return SDL_Unsupported();
}

static void
HIDAPI_DriverStadia_HandleStatePacket(SDL_Joystick *joystick, SDL_DriverStadia_Context *ctx, Uint8 *data, int size)
{
    Sint16 axis;

    if (size < 11 || data[0] != 0x03) {
        /* We don't know how to handle this report */
        return;
    }

    if (ctx->last_state[1] != data[1]) {
        SDL_bool dpad_up = SDL_FALSE;
        SDL_bool dpad_down = SDL_FALSE;
        SDL_bool dpad_left = SDL_FALSE;
        SDL_bool dpad_right = SDL_FALSE;

        switch (data[1]) {
        case 0:
            dpad_up = SDL_TRUE;
            break;
        case 1:
            dpad_up = SDL_TRUE;
            dpad_right = SDL_TRUE;
            break;
        case 2:
            dpad_right = SDL_TRUE;
            break;
        case 3:
            dpad_right = SDL_TRUE;
            dpad_down = SDL_TRUE;
            break;
        case 4:
            dpad_down = SDL_TRUE;
            break;
        case 5:
            dpad_left = SDL_TRUE;
            dpad_down = SDL_TRUE;
            break;
        case 6:
            dpad_left = SDL_TRUE;
            break;
        case 7:
            dpad_up = SDL_TRUE;
            dpad_left = SDL_TRUE;
            break;
        default:
            break;
        }
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_DPAD_DOWN, dpad_down);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_DPAD_UP, dpad_up);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_DPAD_RIGHT, dpad_right);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_DPAD_LEFT, dpad_left);
    }

    if (ctx->last_state[2] != data[2]) {
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_BACK, (data[2] & 0x40) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_GUIDE, (data[2] & 0x10) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_START, (data[2] & 0x20) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_RIGHTSTICK, (data[2] & 0x80) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_STADIA_SHARE, (data[2] & 0x01) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_STADIA_GOOGLE_ASSISTANT, (data[2] & 0x02) ? SDL_PRESSED : SDL_RELEASED);
    }

    if (ctx->last_state[3] != data[3]) {
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_A, (data[3] & 0x40) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_B, (data[3] & 0x20) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_X, (data[3] & 0x10) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_Y, (data[3] & 0x08) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_LEFTSHOULDER, (data[3] & 0x04) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER, (data[3] & 0x02) ? SDL_PRESSED : SDL_RELEASED);
        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_LEFTSTICK, (data[3] & 0x01) ? SDL_PRESSED : SDL_RELEASED);
    }

#define READ_STICK_AXIS(offset) \
    (data[offset] == 0x80 ? 0 : \
    (Sint16)HIDAPI_RemapVal((float)((int)data[offset] - 0x80), 0x01 - 0x80, 0xff - 0x80, SDL_MIN_SINT16, SDL_MAX_SINT16))
    {
        axis = READ_STICK_AXIS(4);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_LEFTX, axis);
        axis = READ_STICK_AXIS(5);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_LEFTY, axis);
        axis = READ_STICK_AXIS(6);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_RIGHTX, axis);
        axis = READ_STICK_AXIS(7);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_RIGHTY, axis);
    }
#undef READ_STICK_AXIS

#define READ_TRIGGER_AXIS(offset) \
    (Sint16)(((int)data[offset] * 257) - 32768)
    {
        axis = READ_TRIGGER_AXIS(8);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_TRIGGERLEFT, axis);
        axis = READ_TRIGGER_AXIS(9);
        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_TRIGGERRIGHT, axis);
    }
#undef READ_TRIGGER_AXIS

    SDL_memcpy(ctx->last_state, data, SDL_min(size, sizeof(ctx->last_state)));
}

static SDL_bool
HIDAPI_DriverStadia_UpdateDevice(SDL_HIDAPI_Device *device)
{
    SDL_DriverStadia_Context *ctx = (SDL_DriverStadia_Context *)device->context;
    SDL_Joystick *joystick = NULL;
    Uint8 data[USB_PACKET_LENGTH];
    int size = 0;

    if (device->num_joysticks > 0) {
        joystick = SDL_JoystickFromInstanceID(device->joysticks[0]);
    }
    if (!joystick) {
        return SDL_FALSE;
    }

    while ((size = hid_read_timeout(device->dev, data, sizeof(data), 0)) > 0) {
#ifdef DEBUG_STADIA_PROTOCOL
        HIDAPI_DumpPacket("Google Stadia packet: size = %d", data, size);
#endif
        HIDAPI_DriverStadia_HandleStatePacket(joystick, ctx, data, size);
    }

    if (size < 0) {
        /* Read error, device is disconnected */
        HIDAPI_JoystickDisconnected(device, joystick->instance_id);
    }
    return (size >= 0);
}

static void
HIDAPI_DriverStadia_CloseJoystick(SDL_HIDAPI_Device *device, SDL_Joystick *joystick)
{
    SDL_LockMutex(device->dev_lock);
    {
        if (device->dev) {
            hid_close(device->dev);
            device->dev = NULL;
        }

        SDL_free(device->context);
        device->context = NULL;
    }
    SDL_UnlockMutex(device->dev_lock);
}

static void
HIDAPI_DriverStadia_FreeDevice(SDL_HIDAPI_Device *device)
{
}

SDL_HIDAPI_DeviceDriver SDL_HIDAPI_DriverStadia =
{
    SDL_HINT_JOYSTICK_HIDAPI_STADIA,
    SDL_TRUE,
    HIDAPI_DriverStadia_IsSupportedDevice,
    HIDAPI_DriverStadia_GetDeviceName,
    HIDAPI_DriverStadia_InitDevice,
    HIDAPI_DriverStadia_GetDevicePlayerIndex,
    HIDAPI_DriverStadia_SetDevicePlayerIndex,
    HIDAPI_DriverStadia_UpdateDevice,
    HIDAPI_DriverStadia_OpenJoystick,
    HIDAPI_DriverStadia_RumbleJoystick,
    HIDAPI_DriverStadia_RumbleJoystickTriggers,
    HIDAPI_DriverStadia_HasJoystickLED,
    HIDAPI_DriverStadia_SetJoystickLED,
    HIDAPI_DriverStadia_SetJoystickSensorsEnabled,
    HIDAPI_DriverStadia_CloseJoystick,
    HIDAPI_DriverStadia_FreeDevice,
};

#endif /* SDL_JOYSTICK_HIDAPI_STADIA */

#endif /* SDL_JOYSTICK_HIDAPI */

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